3D Printed CO2 Rockets with ONBOARD CAMERA!
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- Опубликовано: 17 янв 2018
- In this video I attempt to install mini spy cameras inside of my homemade 3D printed CO2 rockets. These rockets snugly hold 12 gram CO2 cartridges that are normally used in airsoft and paintball guns. I also end up putting the cameras inside of some model rockets! If you haven't seen my previous video on these CO2 rockets make sure you go and watch that as well! The printed used in this video was the Creality CR-10.
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Three ideas:
1: Shorter launch tube with larger diameter. Fins with larger diameter then the rocket, and the rocket stabilized in the tube like a SABOT style projectile. Se wikipedia.
2: More fins. A high number of small fins should increase the effective area causing drag. Having 12 fins should equal having 4 fins with 3 times the area, but the rocket body will be making a hole in the air, so the drag increase would be much less. More like 1,5 to 2 times that of having 4 fins.
3: To increase flight time/height; heat the CO2 cartridge to about 40 degrees before launch. Can be done by storing the rockets in a heating blanket before launch.
Please replay to the comment for more ideas.
a larger tube will lower the pressure inside,I think,the rocket needs to travel a longer distance in the tube,just like a rifle......
But the friction of the tube will also slow down the rocket. If you look at real concepts for rocket launches it is only at the start there is any real advantage to have it in a tube, and if the rocket is stable in construction (i.e. placement of center gravity and center pressure is correct) it doesn't need the tube to stabilize. This can bee seen in any full size rocket as well as in something as simple as water rockets.
One option could even be to fill the bottom of the tube with water to make a better seal against the rocket to increase the pressure right after the start. This has been proposed for many rocket systems like the Space X BFR, and is actively in use with submarine launches.
Another option can be to have a small water tank that the CO2 cartridge is connected to, so that for the first half meter of flight it is actually propelling it self on a stream of water. this would greatly increase the acceleration in the start, but would also make bursting the CO2 seal hard...
Another way to increase the area of the fins without making the rocket have a larger diameter would be to encapsulate them with a ring, like a duct on a propeller. This could connect to all four fins, and could even have a "ribbed" structure to pull even more air into it. All without increasing the total diameter of the rocket.
watch the vid of Richard hammond here on YT on propulsion threw a tube with an air compressor,the tighter the projectile in the tube the longer it goes when fired.
it's on RH connections with the building of the A3880.
very cool! I just got my pen cam in the mail. Not sure why I ordered it but this project gives me some ideas!
PeterSripol peter aaaa
Thanks man! Looking forward to seeing what you come up with!
You're here? omg
PeterSripol cant wait for the vid!!
We all know why you really got a pen cam XD
when you want a legit excuse to buy tiny cameras
Deserves more likes
@Sean Embry do you get fired or the boss is the one that's fired
@Sean Embry noice
@Sean Embry did you get diabetes?
...
From all that *sweet sweet* revenge of course >:D
The stability could be improved by stiffening you launch tube. As it is the rocket causes the barrel to whip around and will flick it off to the side. Three dowels taped around the perimeter would probably do the trick though more would be better.
Do you sell dowels for a living? I would use one.
@@no-name420 Walmart has them for cheap. Just make sure they are straight. Some are warped a bit.
I think the pvc pipe wobbling back a forth also has something to do with the rockets not flying straight :)
Its way late to comment, but its doesn't fly straight because its not balanced. If it was spin stabilized (rotate about the Z axis in flight) it would fly true
that wat i though so still looking at the wind and the weight it also a bit disadvantage as moving up to air the wind speed is increasing so that we dont have enough edge which can cut through it !!!!!!!!!!!!!!!!!!!!
(lets hope you got it)
me too i saw the guy's hand move forward a little when the black rocket end was in but the head was out
testtestjimmy if it was spin stabilized it would be useless for video
Tary1233 maybe a brass or metal pipe could do better
Kerbal CO2 program 😂
Glubschikon 😂😂
Is it hydrogen in it?
no
@@legendarychirag9231 ok
Space engineers: micro
Awesome!! Love that you are working the trial-and-error process and making improvements each time. For a more stable launch, try cutting 50cm off the launch tube. It appears that the PVC tube bends during launch causing friction to the rocket and an unstable trajectory upon launch? A shorter tube may correct that. Try different lengths. Keep up the great work, and I can't wait to see what you come up with next!!
Launch Co2 rocketa on summer time. It flies much faster.
heating up cylinder a bit might help without melting plastic.
seems like winter the air would be dryer with less water humidity, and therefor have less resistence, so rocket should fly higher
@@SystemsPlanet
Dry summer day should be best. The temperature of the air and the plastics on the rocket matters since the CO2 container itself will rapidly become colder due to the decompression.
FYI spring loaded fins would work or a smaller rocket with a discarding sabot either of these would allow the rockets to fly straight. Also you should make a video about redesigning these rockets as torpedoes that would be awesome.
Really nice work, man! And congratulations to the winners! Specially to Creating Creations! :D
MC's Creations Thanks:)
You should try putting a sabot on the rocket and launching it from a larger diameter tube. That way your fins can be significantly larger than the outer diameter of the rocket.
I have never built a rocket before. Just designed black powder rifles. lol
this
Lots of good solutions or suggestions in the comments.
It’s funny how people are idiots and usually this only gets worse as you get more people involved…and yet in the YT comments sections, which often the pinnacle of human stupidity and mob mentality run amok, and yet… and yet…
The feeling when you cant find your model rocket...
Ive been there with my mini quads, I have already lost 3 and I have somehow lost my model airplane which shouldnt be too hard to find but its just gone.
This video is definetly worth a sub, your content is great
I avoid the 'losing' feeling by just gluing fins onto my rocket engines, and if I'm feeling real crafty I toss a nose cone on the engine.
I feel like your launch tube thing needs to be more vertical, more stable, more rigid, for vertical and more lubricated
A bit late in coming, but as an alternate design suggestion, try making a CO2 spigot mortar.
For anyone who hasn't heard of a spigot mortar, look up the British WWII PIAT (stands for Projector, Infantry, Anti-Tank). The projectile goes over the firing tube, not inside, so you don't have to create such a small payload.
Simple stability testing: With everything loaded (engine and payload) make a loop on a string and put it around the rocket body. Move the loop until the rocket will balance horizontally, then tape the loop so it can't move. No you can spin the rocket around in a circle on the string, if the nose cone stays forward you have a stable design, if not you need bigger fins or more weight towards the nose. It's what the rocket does while in the air that matters most.
Nice work. Something I couldn't quite finish 40 yrs ago. Fuel was a problem then. Had to manufacture it from matchstick heads. Greetings from New Zealand 🇳🇿
Powdered zinc and sulfer we used to fire them in a homemade bazooka..used those Estes ignitor
Loved this video, and the co2 rockets in general. I do notice in the slow mo's that you get a bit of whip in the end of the launch tube...have you considered using Schedule-80 pipe (the black stuff), it's meant for high pressure, therefore much more rigid that then schedule 40 (white). Just a thought, keep up the great videos
I would recomened peter stripols javlen roocket series to figue out foldable fins
randomness yay - same idea. But I had suggested to take the RPG-7 propelled grenade and make a less deadly copy :-) Foldable fins rock
A couple of thoughts:
1)The Firing Pin. Have it secured in a bearing, much like a firearm does. The Hammer is spring loaded weight, not the firing pin. That way it strikes where it suppose to every time.
1a) Sharpen the tip of the nail with more insight. If the rocket fins deliver a rotation to the missile, cut the firing pin so that the escaping exhaust is channeled into a slight spiral towards the fin direction. However, any rotation won't make for a very good camera view, so bag the fin idea entirely, . .
2) And use the old fashion STICK method. Cut a thin groove along the launch tube for the balance stick to slide up when fired. The Stick shouldn't be heavy, for it only acts like a drag rudder. (Think "Bamboo". . ) If it were a hollow tube, it would be lighter and would work even better, being that it would act like a pseudo "fin" as well. . . But, it still needs to be long and ridged enough to stabilize the missile against the air flow to keep the pointy side up and the stinky side down..
Oh yeah. . . Reinforce the nose cone. In fact, make it a rounded blunt. Your rockets don't achieve super sonic speed, so in all reality, a pointed nose cone will induce more drag, where as the rounded aspect is the way air naturally flows traveling at a sub sonic speed. And always remember, the way it went up, will be same the way it comes back down. Pointy end first.
Problem solved?
The young Sheldon has grown and has become a rocket scientist. Who would think that! I´m glad!
Thanks for the keychain.
Thank you for completing a satisfying video, despite all the setbacks!
I launched many model rockets as a kid. The simpler the rocket the better and more stable they go. You could also go with multiple stage rockets. There used to be a model rocket called an egg launcher. It had a three engine cluster. Three size C-6-7 engines. The difficulty was getting all three engines fire at the same time. You could also buy a kit with an assortment of tubing, nose cones, balsa wood to create your own designs.
The Co2 rockets launching reminds me of how a cruise missile looks when they first launch. They too, are a bit unstable until they get going. I used to really enjoy launching model rockets, but like you discovered, they’re easy to lose or even more frustrating to find them dangling in a tree and out of reach! Thanks for your efforts.
Michael Patterson hi
All you need to do is increase the amount of drag on the bottom of the rocket. Try making a tower instead of using a tube, you can still use your current device to launch it just make it shorter with slots for the fins. If you have questions reply and I can help.
that phill bot the only issue I'd see with that is that the expanding gasses create pressure, which in turn gives the rocket thrust. But, like a bullet, this only works in a chamber like the tube. If he had a way to provide more propulsion than I think the slotted launcher would be a great idea
I think you're on the right track with the drag at the back. Perhaps extending the straight body of the rocket down over the aft taper a little to form a kind of skirt.
Hopefully YT won't mangle this ASCII-art...
Before:
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After:
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Should let you keep diameter the same while adding some aerodynamic drag and allowing for the existing fins to stay.
The open slot in the bottom for the trigger negates that.
Put a whistle on them now
hmm remembers me of 1942 no no Germany bomb …
Neat stuff! Years ago (read, "pre-digital"), Estes marketed the Cineroc. It was fitted with a miniature movie film camera. All cool and stuff, but I don't recall seeing any flight films, so I don't know how well it worked. Really enjoyed this one, thanks!
Launch tube is too long a wobbly. Stabilize the tube and set the launch like a mortar shell design fins so the fold around the fuselage. Once rocket eject from tube fins will fold out with help from rubber bands, tensioned bamboo, springs, or even air drag shape. Liked the ideas.
I can think of a couple of fixes that would require varying levels of effort. The easiest way would be to not print the fins, and simply glue fletching to the side of the rocket then wrap it in wax paper to reduce the friction. Once the rocket exits the tube the fins will unfurl and the paper will just float off to the side. The other concept is to do away with the launch tube altogether, and design a launch mount with more standard model rocket features.
Just completely remove the pvc pipe and use a slightly modified(like a 1 inch hole drilled into the base of the launch pad where you put the nail spring thing) version if the estes model rocket launch pad.
P.s. 3d print a little tube to align the rocket with the launch pad.
I love brief construction montages. Bring it on!
I saw your video and tried some of my own rockets. I didn't think to capture footage, but I decided to use a shorter tube. MUCH shorter, but added extended fins to the rocket. The extended fins made it so I did not need the longer length of pipe. My total PVC pipe length is only 14". What I did at the top was cut channels 8" down into the pipe, like a cross [+] if looking down the pipe. The channels are about 1/4" wide. I made my rockets with fins that extended about 20mm from the body. The rocket stabilizes amazingly. I didn't do the camera mod, but did use about 1oz. of clay, as mock weight, and it worked quite well. I did a generic 35-degree angle on the fins, but I'm sure you can try any design, shape, or angle you feel is necessary. Only piece of recommendation is make sure you sand the channels in the PVC pipe, WELL, and maybe round the corners a little.
you could make triple spring loaded fins on a hinge to make the rockets fly, it can probably fit, considering you can easily 3d print a small mechanism.
But they would scrape on the barrel
Fred Frod if you make a spring loaded set of fins that have a weak spring in it, then it won’t be a big difference compared to what occurred now. Only thing you have to do is making a pin that will lock the fins in place when it is fully extended. That way it has almost no drag, but it can extend those wings to a bigger size
The rocket itself already "scrapes" on the barrel. The added drag would be minimal.
Still better than anything North Korea has at the moment lol
Fordman 1991 incorrect but if it brings some people comfort then sure.
Nope. They actually launched a rocket that probably went further than any amateur builds.
/r/wooosh
The North Koreans might surprise you on their tech and ability to send a heavy missle. While your comment was funny,....way off the mark.
@@mihirpatil8843 their rockets are decently advanced but definitely not as good as any structured country like the USA.
when I was a kid we had a similar rocket with a camera and parachute already built in. That was probably one of the coolest toys I ever got to play with or, more accurately, watch my older brother play with.
North Korea missile testing
you rockets are really cool but now you need to build a sturdy launch pad and a more accurate pin for your puncture.
The USB cam is on a flexible cable ...you could poke it out the side and point it down to get a cool shot. Just print a nacelle on both sides to balance drag.
Cool projects!
You can actually learn an amazing amount about rocket/fluid mechanics through tests like these
Add folding fins to it, Like rocket grenades or anti tank rocket launcher head's have.
Some apple farmer is gunna be so confused.
I would suggest adding a drogue - a rolled-up strip of paper or a string - to the rear of the rocket, that would unfurl and trail the rocket after launch; not enough to slow it very much, but enough to add drag aft of the rocket body as a stabilizer.
Your fins do that somewhat, because they have blunt leading edges - but they should be thinner and wider.
Stabilizing fins only work if the rocket is not deflecting the air away from the fins, so they need to protrude into the airstream more.
One way to achieve this wider fin and still retain both alignment and the compressive launch effect in the tube behind the rocket would be to use a slightly larger tube, and surround the rocket with a short section of sabot - a split sleeve that would fit tightly around the upper body of the rocket and be a slip fit in the larger PVC launch tube. It would separate almost immediately once the rocket left the tube, falling to the ground a few feet away, leaving the rocket to fly free. That also increases the area against which the pneumatic thrust operates, increasing muzzle velocity.
Finally, the PVC tube is very floppy and unstable; I'd use thicker-walled rigid PVC, and mount a 2-axis level on the tube so that you can keep it perpendicular - it's usually at a cant when you launch, making the rocket recovery more problematic. Hope this helps - fun video!
Way cool! We built Co2 dragsters in high school for a wood shop / science project. 100' of deep sea fishing line taunt between two points and supped up pinewood derby cars with eyelets on the bottom. Same idea and it was loads of fun for a bunch of seventh graders. We had a few mishaps at the starting line but I still remember it like it was yesterday. Seen the description in the video title and had to take a look. Thanks for the video. Great job!
Creative idea well executed
Thank you!
Could use something like a sabot for the fins and use a thicker tube
On a more serious note, spring-loaded fins? In the tube, the fins would be partially in the rocket, then right after launch the fins would be released to deploy to their full extent, then get stopped by beads at the bases of the fins, thick enough to stop against the slots for the fins but thin enough not to catch on the spring housings that'd basically be holes to hold the beads and the springs. Pins could be used to secure the fins at the tops and help pivot the fins out smoothly. Complicated but useful design that'd build slightly more pressure it the tube, giving it more power in launching, maintain efficiency better after launching and promote better stabilization without changing the rocket or tube size. The bases of the fins could also be angled slightly and edges lubed so it'd squeeze into the tube much easier and not risk pressure spikes so much during launch due to any inconsistencies on the tube walls. Alternately, using vents to push the fins out with CO2 would be easier to build but after the cartridge is empty the fins would collapse and you'd LOSE more efficiency than before in exchange for promoting better stability. I hope that helps.
The shape of the punch hole will affect the flight. You want mice and uniform. I suggest looking at rocket motor nozzle cone shapes and using a lathe to make a nice firing pin. Good luck
Cant you try making he fins spiral a little bit so its more accurate? Ofcourse thats not good with camera but it sure makes a beautiful launch :)
Came here to suggest that. NASA flies sounding rockets ("Super Loki") that spin to give them more stability.
But spin when you are trying to take video is generally a bad thing. Yes the rocket would be more stable in flight but the video would just be spinning round and round.
You should make the fins riffled so it has a steady spin in order to fly straight high and stable
you want it to spin less. you won't get good videos if it's spinning a lot.
who gives a fuck about videos, if you can't even get your rocket stabilized?
Fins are designed to mage the rocket spin, not to get rid of the spin. Spin is a good thing for rockets and projectiles, that's why you have rifled barrel guns. Also that shitty camera won't make any good footage ever, there is no point of fucking up the whole rocket for it
Actually, fins are designed to stop it from spinning and to move its center of pressure behind its center of mass(especially with unguided rockets)
Fins create drag. Spin created by fins creates more drag.
@@MrDoboz the point of the video is too get good footage dickhead
I use too fly model rockets when I was a kid, I use to test them for stabilization by tying a string around the CG point ans then spinning around
The nail is wobbling. It only needs to go into the rocket far enough to puncture the co2 cartridge, so fit a collet that far down its shaft (or a centering collar in the pipe)
The flex in the pipe isn't a big deal but you can make it _much_ more rigid by mounting it to a length of angle aluminium (or angle plastic if weight is an issue)
Fins: these are going to make it more stable, but they're also going to make it more draggy. You might want to get old of one of the old model rocketry handbooks.
One of the points from those books: A BLUNT nose is better (hemisperical). You're not getting anywhere near pointy nose speeds and the drag of a pointy nose has a lot to do with your instability.
Cutest dog!!
Just got recommended this vid. You want good footage you should just drop the rocket idea and make a nice, slow hot air balloon with a 3d printed "basket" or do what everybody else does and use a drone. If you are going to stick with the rocket idea you need much larger fins and then design a different launcher. I did tons of this stuff when I was kid, usually through boy scouts. Ironically for your project the best flying rockets usually have the tail fins all ever so slightly pointed in one direction so the rocket flies with a spin like a bullet/football. Also consider a flasher and launching near dusk so you can find it afterwards.
One way you can test rocket stability is to tie a string to the balancing point of the rocket. Now swing the rocket round and round over head. You can add or remove nose weight (clay, lead shot, etc) to make the rocket stable. As for the fins, have a look at some of the smaller military rockets. A lot of these like the LAW (Light Anti-tank Weapon) use fins that fold “upstream” in the launcher. When fired, the fins pop out and swing back and stick out at a considerable angle for good stability.
If you want to add a parachute, you could just somehow attach it to the top of the rocket with some strings. Like that, when it's flying upwards, the parachute is being held down by the wind that is produced by the motion of the rocket. When it falls down though, the wind goes under the parachute and the rocket can get to the ground much more safely. I'm not 100% sure this'll work with a rocket as it might disturb the flight path, but we did a similar thing with a meteorological balloon, and it worked like a charm.
Simply cut lines in the tube and add bigger fins to fit between the lines :P
Mr. unitato the pvc would become too flimsy because it is so thin and long, the fins would catch against the inconsistent gradient of the cuts, the gradient being caused by warping in the pvc
P.A.N. what about a square tube?
I think a square tube with the fins aligned in the corners and a sabot would work well
Interesting idea thanks!
Use pen camera, USB is much lower quality, maybe try to make wings wider than rocket, like this air go next to them so they don't do anything... i think :)
Take some more rugged pipe and cut holes for wings to it, i noticed that on slow motion pipe is pretty soft and it bent on start.
Oh and mount cam on top, not on side, it will rotate much slower and image won't be so blurred
Use mouse traps for the spring pop out fins
larger tube to permit bigger fins, ribs atop to keep it aligned and if a seal is needed to capture the pressure as well as using the thrust. of the gases, a semi-disposable disk or cone that falls away when the pressure in tube decreases. I didn't see the earlier videos so I don'tknow if you used exact tube size to contain pressure
Compressed air, a longer bigger barrel and one or two sprinkler valves will send whatever you put inside a lot further than a CO2 cylinder. I never had a 3D printer to help with aero dynamics so I'm envious. I've sent golf balls a 1.5 miles in a 3" barrel and the only thing I used to make them go straight is a hole drilled to pound in a roofing nail. A dab of glue works too but never had much time to wait. Look up how to modify 1" sprinkler values into instant dump valves. Plus you need a chamber.
So for the fins, why not have 4 fins that are spring loaded? When placing the rocket in the tube, manually press the fins in, and slide into the tube. Then, when it gets pierced and exits the tube, as soon as it exits, the fins will spring out and have more stable flight?
SilentAirGunner but it might slow it down
Cut three slots in the pvc tube so longer fins could work
Alpha_wolf 1987 you wouldn't have as much pressure to the rocket
You wouldn't have much of a launch
your project just reminded me of the movie "October Sky". Enjoyed a lot. Thanks
Just cut channels into the PVC pipe to allow room for the fins. Might need a thicker pipe though. this could also help keeping the camera pointed in one direction.
try the cam on front of the rocket
Put a Parachute on it
It most lil won't help with camera footage, but setting the rocket fins on an angle to the rocket spirals on its ascent would help keep rockets stable during flight :)
use a compliant material for the fins. Wire/leaf spring and fabric? Springs into shape once deployed.
when you have all the technology and none of the knowledge needed to build a rocket...
Please don't drill in objects you're holding in your hands. Younger viewers might get inspired.
Write your phone number on your rockets, that way, if it gets away from you, you might a phone call when someone else finds it.
lhl2500 So he can get sued for broken winshields and Windows?
Bruh...
Well, if he broke something, wouldn't it be right to actually pay for damages?
Don't give your 10yo a drill...
you didnt have a drill when you were 10?
To help you find the rocket when it lands, put some bacon inside it. Then train a dog to sniff out the bacon.
Just some suggestions: If you want to continue launching the C02 rockets from a tube you need to get a more rigid pipe (metal thin walled fence post comes to mind, or electrical conduit). Also you are on to something with the mortar shells idea. Only make the fins the widest part and longer than 1/4 the length of the rocket with a taper on the leading edges to the body of the rocket.
The fins would dictate the width of the pipe. And the ridged pipe would ensure they sit square in the pipe until they are launched.
Trudeau bans CO2 rockets ;)
i hate trudeau
4:22 It seems to me the reason both parts of the rocket broke off is because you released the CO2 pressure INSIDE the plastic rocket body, but (with the nail mostly filling the exit nozzle) it had no way to get out. The plastic, glued-together body could not hold that much internal pressure, so both ends blew off.
*Write a "return to" with an address or number on it, I'm sure someone will find it* 😁😁
if it hits a window or smthin or a person or idk then they will know who did it
Tokyodriftbabys
That wold be funny
That rocket had a parachute. It is unlikely that it would damage anything on landing. Even if they go ballistic, they are not capable of doing much damage. They just don't have the weight or energy to break glass. The only windows that would be at risk from a vertical launch would be windshields and they are extremely strong safety glass.
ah ok but it was just an idea
dstnlockwood
Take this as a compliment my friend, coming from a black man I must say in all my years it will never cease to amaze me the White , Anglo , Icelandic, Germanic, Celtic and related blood are the only ones who “invent”, “teach”, show tutorials, help others with ideas that further advance civilization as we know it. I am ashamed of my people as the videos they produce are selfishly based IE want to be rappers, dancers, entertainers, they want to make millions but they do not want to work for it or use their minds. Rapping and dancing and making world star videos laughing at drowning victims are not what I would consider conducive to the growth of the civilized world. Thank you for this very interesting video and continue using the gift God has blessed your people with, YOUR MIND!
I understand. Thanks, I get a lot of grief from liberals.. my apology
If you ask me, and yes, I'm well aware that you didn't, but I think part of the problem with your rockets leaving the launcher all squirrely is due to your launcher being too flimsy. I notice in the slo-mo's, the PVC pipe flexes and wobbles as the rocket travels through it and exits. If you could make a completely rigid launch tube, say out of metal pipe, I think you would eliminate most, if not all of this problem. At least any squirreliness of the rocket, would be entirely due to the rocket itself, and not compounded by the flexing of the launch tube. Just my two cents.
A few things I noticed immediately that you eventually gathered and/or maybe never did:
1. The nail was an extremely ineffective way to launch due to it being responsible for things that couldn't be reproduced again and again for testing, good or bad.
2. The launch system wad a poor choice as it flexed, wobbled, bowed, etc. This absolutely had a further impact in stability and events that can not be reproduced again and again for testing.
3. The higher the weight the less stable a rocket is with a single nozzle at the bottom (regardless of fuel used). It's like asking someone on stilts to be more stable than someone crawling.
4. The 3d printing itself likely led to instability.
Overall, very neat video and I'm glad you finally got it to work. In the future, include a small piece of rolled-up paper with your details in case you lose the rocket again.
I like the pop out fin idea... I have a few ideas. Part of the thing that makes the c02 rockets cool is the compactness of it all.. I think you might lose the novel element a little if it starts to look like a normal model rocket. You could either have the fins fold against the body of the rocket, or pop out through slots. Fold-out first: One could employ a teeny spring on the hinge of each fin cause it to deploy as soon as it clears the launch tube. One could also recess a cavity where the fins fold in, so that it doesn't make the design any bulkier... a little complicated maybe... I think the fins can be curved to hug the body of the rocket when collapsed... if having them all hinge in the same direction causes spiraling, you could "butterfly" the fins instead (Two sets of fins, each set sharing a set of hinges, so it would have a quasi tie-fighter look when viewed on end with fins open)... it would be an eccentric fin design... but I think it would still work.The other idea I had would be to have them pop out from the body through little slots... being pushed out automatically by springs or some kind of squishy material inside once it clears the launch tube.. The limitation here is the hole you have to allow for the puncture pin... So basically you have the distance from the outside of the shaft that contains the puncture channel to the inside of the shaft that comprises the body of the rocket itself to build your fin structure. Since the fin has to retract, it realistically can't occupy all of that space even using a spring with a high expansion ratio... or wait!... maybe with a leaf spring you could.. now this gets even more technical but if the spring was just one long piece of spring steal that wants to return to an arc that would fill the required distance to expel the wing... you could use most of the space to fit your fin! Where have I seen springs like that... hmmm... AH! Window screens! On the edge of most windows screens you will find the kind of spring I am talking about.. One of those under each fin will give you the biggest fin allowable. Good luck!
If you end up doing the "pop-out" wings... I also suggest putting a radius on them, this would have 3 benefits, the fins would dive away at the top and bottom, making it easier to insert into the tube... the leading edge of most fins dive into the body already, I imagine to aid in cutting through the air.. the less obvious benefit is that, since you are launching from a tube, anything you can do to reduce friction in that launch is gonna preserve energy for lift, since the fins are round, very little of their edge will actually touch the body of the tube, and the spring load on the fins will help center and distance the lower body of the rocket away from the walls of the tube... should make for a smoother shoot.
2 stage rocket, where 2nd stage pops out spring loaded fins hidden in spiral slots? how do you trigger the 2nd stage and drop off the first stage?
Do you mind sharing your recent design STL's I only saw your older ones online! I debating on trying these for my science class!
You could have saved a bunch of time and money. Buy the "shaft" at an adult store and just add some fletchings. They look exactly like your rocket body.
On a serious note, you could get a lot more stability if you installed the CO2 cartridge backwards, then route the gas to the nose with a hose or line. At the nose, add a nozzle that distributes the gas evenly through the port holes in it. Something like the air cap on pneumatic paint sprayers should work perfect. That would also allow you to make thrust adjustments by changing the size of the nozzle. With the CO2 cartridge at the bottom there would be a static stability meaning if you drop it, it will always land vertically. With the gas venting from the nose rather than the tail you also get a thrust based stability meaning it will always fly straight and never tumble. When you have the gas pushing from the tail, the body is inherently unstable because the fulcrum is above the thrust point. Think of it this way: When you balance a broom in your palm, you have to constantly fight gravity and move your hand to keep it from falling. Now grab that same broom by the head and let gravity keep the handle perfectly straight without requiring any correction or input from you. The broom is in the same orientation, has the same weight distribution and is pointed in the same direction but one of them is extremely unstable while the other is 100% perfectly stable. Just something to think about the next time you build one.
That's awesome now strap the rocket Cam to a triangulated array of weather balloons and ignite the model rocket engine at 80,000 feet via a burst disc triggered by low air pressure. Don't forget to seal the model engine via hot glue at sea level to aid in ignition in a less dense atmosphere once at the edge of space.
Try making the fins curved on the rocket, see a modern arrow to see how it works. It makes the projectile fly straight by spinning the object in flight in the same way the rifling in the barrel of a gun causes the bullet to spin in flight. It would certainly improve the flight of the rocket but of course the film footage would be compromised
I love it, Empirical design. Fast make / test / improve. ❤❤
I'm currently learning the art of 3D printing! So far, that's been a learning experience!
I recommend using a sharpened drill bit to make the puncturing nail. Super durable and stays sharp longer than the nail.
A large part of your instability is most likely coming from the tube you are launching from. No, I'm not talking about the tube "Wobble" that others have pointed out. I believe a large part of your problem is because your tube is not ported. This lack of porting allows extra pressure to build behind your "rocket" as it leaves the tube. Essentially you have two sources of propulsion at this point, the force exerted on the rocket by the CO2 cartridges, and the back-pressure behind the rocket created by the exhausted and expanding CO2. By porting the tube from the bottom up (sort of like a muzzle break), you will allow the exhausted gas to ventilate, allowing the rocket to fly straighter because the tube would only serve as a guide for the rocket. I would also suggest a tube made of conduit to prevent any flexing that would occur after porting a PVC tube. Love the videos.
a sabot may work or some sort of rifeling on the rocket or fins to make it rotate
For the CO2 launch mechanism, cut 2 long grooves the entire length to accommodate larger fins, then reinforce to pipe with a large diameter ring with support braces
For the CO2 rockets use a short and thin guide rod instead of the long tube so you can put bigger fins. Bring the fins up a bit so you can still fit the bottom of the rocket into the tube with the launch mechanism. Put a thin layer of graphite on the guide rod.
I still have a rocket kit that I bought back in the 80's that has a built-in film camera that takes a single shot after apogee when the nose cone is ejected for deploying the parachute. I used to get really cool pics of the area that I was launching from because the camera would be facing downward when the shutter was released. If you want to get some amazing footage with your setup, try installing your camera on an Estes rocket/glider or something similar. The rocket boost stage launches the vehicle, and then it glides down in an adjustable spiral. So you could video of the launch and then great video of the glide down.
also keep in mind that CO2 condenses greatly in cold temp and gets colder by the expansion of gasses once punctured. Maybe try put the canister in extremely hot water before shooting. You could also make fins larger than the fuselage diameter by cutting grooves in a PVC pipe for the number of fins and fixing those in a larger diameter pipe.
I think use a larger diam. tube with a sabot for the rocket body, the sabot would need to be as light as posable, the larger tube would give room for wider fins?
To help you locate a "lost" rocket, try inserting a very HIGH PITCHED "Noise maker" and several SUPER BRIGHT FLASHING LEDs with a long lasting battery. Both are super cheep and can have a small switch allowing them to be turned on at launch time. Keep the wiring INDEPENDENT of each other so they can serve as a backup to each other. If one circuit fails (I.e. Bad Solder joint Etc) it won't affect the other circuit.
Nice vid I have never seen a experiment like this I have wanted to make a CO2 rockets but I don't have the stuff to make it but awesome vid.!!!!
Alternate title: perfecting the design of homemade mortars
Okay a major reason for the rockets breaking is the use of non precut thick wall pvc. I would highly recommend using metal pipping for several reason, also try stabilizing the launch pad to solid ground instead of trying to compensate for the pressure instability with your hand.
Impressed with your dedication. You kept trying which finally paid off!
Some projectiles use scissoring fins. While they are in the launch tube, the fins are folded inward and upward, next to the body. After they launch the fins scissor backwards, extending outward and locking into place. Some hunting arrows do this as well.
Try using a steel tube as your launcher for more stability. Sharpen the leading edges on your fins to reduce drag and provide more bite in the air. Also try letting the falling weight puncture the CO2 cartridge so there are no air leaks from your firing mechanism. Hope this helps!